isc/unix/net.c

	net.c revision 70e5a7403f0e0a3bd292b8287c5fed5772c15270
4a53e3c2b83c476a93148eaee0272649beb221caMark Andrews/*
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * Copyright (C) 1999-2003  Internet Software Consortium.
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt *
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * Permission to use, copy, modify, and/or distribute this software for any
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * purpose with or without fee is hereby granted, provided that the above
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * copyright notice and this permission notice appear in all copies.
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt *
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt * PERFORMANCE OF THIS SOFTWARE.
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt */
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt/* $Id: net.c,v 1.35 2007/06/19 23:47:18 tbox Exp $ */
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#include <config.h>
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#include <errno.h>
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#include <unistd.h>
4a53e3c2b83c476a93148eaee0272649beb221caMark Andrews
4a53e3c2b83c476a93148eaee0272649beb221caMark Andrews#include <isc/log.h>
4a53e3c2b83c476a93148eaee0272649beb221caMark Andrews#include <isc/msgs.h>
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#include <isc/net.h>
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#include <isc/once.h>
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#include <isc/strerror.h>
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#include <isc/string.h>
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#include <isc/util.h>
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRANY)
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntconst struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
4a53e3c2b83c476a93148eaee0272649beb221caMark Andrews
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRLOOPBACK)
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntconst struct in6_addr isc_net_in6addrloop = IN6ADDR_LOOPBACK_INIT;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic isc_once_t   once = ISC_ONCE_INIT;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic isc_once_t   once_ipv6only = ISC_ONCE_INIT;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic isc_once_t   once_ipv6pktinfo = ISC_ONCE_INIT;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic isc_result_t ipv4_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic isc_result_t ipv6_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic isc_result_t unix_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic isc_result_t ipv6only_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic isc_result_t ipv6pktinfo_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic isc_result_t
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunttry_proto(int domain) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    int s;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    isc_result_t result = ISC_R_SUCCESS;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    char strbuf[ISC_STRERRORSIZE];
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    s = socket(domain, SOCK_STREAM, 0);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (s == -1) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        switch (errno) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef EAFNOSUPPORT
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        case EAFNOSUPPORT:
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef EPROTONOSUPPORT
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        case EPROTONOSUPPORT:
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef EINVAL
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        case EINVAL:
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt            return (ISC_R_NOTFOUND);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        default:
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt            isc__strerror(errno, strbuf, sizeof(strbuf));
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt            UNEXPECTED_ERROR(__FILE__, __LINE__,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                     "socket() %s: %s",
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                     isc_msgcat_get(isc_msgcat,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                            ISC_MSGSET_GENERAL,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                            ISC_MSG_FAILED,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                            "failed"),
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                     strbuf);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt            return (ISC_R_UNEXPECTED);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef ISC_PLATFORM_HAVEIPV6
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef WANT_IPV6
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (domain == PF_INET6) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        struct sockaddr_in6 sin6;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        unsigned int len;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        /*
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt         * Check to see if IPv6 is broken, as is common on Linux.
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt         */
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        len = sizeof(sin6);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        if (getsockname(s, (struct sockaddr *)&sin6, (void *)&len) < 0)
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt            isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                      "retrieving the address of an IPv6 "
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                      "socket from the kernel failed.");
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt            isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                      "IPv6 is not supported.");
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt            result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        } else {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt            if (len == sizeof(struct sockaddr_in6))
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                result = ISC_R_SUCCESS;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt            else {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                isc_log_write(isc_lctx,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                          ISC_LOGCATEGORY_GENERAL,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                          ISC_LOGMODULE_SOCKET,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                          ISC_LOG_ERROR,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                          "IPv6 structures in kernel and "
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                          "user space do not match.");
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                isc_log_write(isc_lctx,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                          ISC_LOGCATEGORY_GENERAL,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                          ISC_LOGMODULE_SOCKET,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                          ISC_LOG_ERROR,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                          "IPv6 is not supported.");
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt            }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    (void)close(s);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    return (result);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic void
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntinitialize_action(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    ipv4_result = try_proto(PF_INET);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef ISC_PLATFORM_HAVEIPV6
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef WANT_IPV6
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    ipv6_result = try_proto(PF_INET6);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef ISC_PLATFORM_HAVESYSUNH
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    unix_result = try_proto(PF_UNIX);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic void
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntinitialize(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    RUNTIME_CHECK(isc_once_do(&once, initialize_action) == ISC_R_SUCCESS);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_result_t
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_net_probeipv4(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    initialize();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    return (ipv4_result);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_result_t
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_net_probeipv6(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    initialize();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    return (ipv6_result);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_result_t
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_net_probeunix(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    initialize();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    return (unix_result);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef ISC_PLATFORM_HAVEIPV6
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef WANT_IPV6
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic void
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunttry_ipv6only(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef IPV6_V6ONLY
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    int s, on;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    char strbuf[ISC_STRERRORSIZE];
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    isc_result_t result;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    result = isc_net_probeipv6();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (result != ISC_R_SUCCESS) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv6only_result = result;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        return;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifndef IPV6_V6ONLY
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    ipv6only_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    return;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#else
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    /* check for TCP sockets */
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    s = socket(PF_INET6, SOCK_STREAM, 0);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (s == -1) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        isc__strerror(errno, strbuf, sizeof(strbuf));
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        UNEXPECTED_ERROR(__FILE__, __LINE__,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                 "socket() %s: %s",
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                 isc_msgcat_get(isc_msgcat,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                        ISC_MSGSET_GENERAL,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                        ISC_MSG_FAILED,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                        "failed"),
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                 strbuf);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv6only_result = ISC_R_UNEXPECTED;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        return;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    on = 1;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv6only_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        goto close;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    close(s);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    /* check for UDP sockets */
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    s = socket(PF_INET6, SOCK_DGRAM, 0);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (s == -1) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        isc__strerror(errno, strbuf, sizeof(strbuf));
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        UNEXPECTED_ERROR(__FILE__, __LINE__,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                 "socket() %s: %s",
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                 isc_msgcat_get(isc_msgcat,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                        ISC_MSGSET_GENERAL,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                        ISC_MSG_FAILED,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                        "failed"),
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                 strbuf);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv6only_result = ISC_R_UNEXPECTED;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        return;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    on = 1;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv6only_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        goto close;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    close(s);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    ipv6only_result = ISC_R_SUCCESS;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntclose:
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    close(s);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    return;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif /* IPV6_V6ONLY */
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic void
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntinitialize_ipv6only(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    RUNTIME_CHECK(isc_once_do(&once_ipv6only,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                  try_ipv6only) == ISC_R_SUCCESS);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif /* IPV6_V6ONLY */
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic void
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunttry_ipv6pktinfo(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    int s, on;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    char strbuf[ISC_STRERRORSIZE];
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    isc_result_t result;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    int optname;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    result = isc_net_probeipv6();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (result != ISC_R_SUCCESS) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv6pktinfo_result = result;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        return;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    /* we only use this for UDP sockets */
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (s == -1) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        isc__strerror(errno, strbuf, sizeof(strbuf));
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        UNEXPECTED_ERROR(__FILE__, __LINE__,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                 "socket() %s: %s",
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                 isc_msgcat_get(isc_msgcat,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                        ISC_MSGSET_GENERAL,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                        ISC_MSG_FAILED,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                        "failed"),
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                 strbuf);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv6pktinfo_result = ISC_R_UNEXPECTED;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        return;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef IPV6_RECVPKTINFO
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    optname = IPV6_RECVPKTINFO;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#else
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    optname = IPV6_PKTINFO;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    on = 1;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (setsockopt(s, IPPROTO_IPV6, optname, &on, sizeof(on)) < 0) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv6pktinfo_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        goto close;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    }
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    close(s);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    ipv6pktinfo_result = ISC_R_SUCCESS;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntclose:
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    close(s);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    return;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntstatic void
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntinitialize_ipv6pktinfo(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    RUNTIME_CHECK(isc_once_do(&once_ipv6pktinfo,
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt                  try_ipv6pktinfo) == ISC_R_SUCCESS);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif /* ISC_PLATFORM_HAVEIN6PKTINFO */
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif /* WANT_IPV6 */
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_result_t
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_net_probe_ipv6only(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef ISC_PLATFORM_HAVEIPV6
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef WANT_IPV6
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    initialize_ipv6only();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#else
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    ipv6only_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    return (ipv6only_result);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_result_t
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_net_probe_ipv6pktinfo(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef ISC_PLATFORM_HAVEIPV6
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#ifdef WANT_IPV6
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    initialize_ipv6pktinfo();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#else
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    ipv6pktinfo_result = ISC_R_NOTFOUND;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt#endif
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    return (ipv6pktinfo_result);
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntvoid
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_net_disableipv4(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    initialize();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (ipv4_result == ISC_R_SUCCESS)
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv4_result = ISC_R_DISABLED;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntvoid
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_net_disableipv6(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    initialize();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (ipv6_result == ISC_R_SUCCESS)
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv6_result = ISC_R_DISABLED;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntvoid
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_net_enableipv4(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    initialize();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (ipv4_result == ISC_R_DISABLED)
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv4_result = ISC_R_SUCCESS;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntvoid
ef421f66f47224a42073deaf087378c5d0c9952eEvan Huntisc_net_enableipv6(void) {
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    initialize();
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt    if (ipv6_result == ISC_R_DISABLED)
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt        ipv6_result = ISC_R_SUCCESS;
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt}
ef421f66f47224a42073deaf087378c5d0c9952eEvan Hunt